diff --git a/libuavcan_drivers/stm32/driver/src/uc_stm32_thread.cpp b/libuavcan_drivers/stm32/driver/src/uc_stm32_thread.cpp
index cdc54cadd1..eb93cc215f 100644
--- a/libuavcan_drivers/stm32/driver/src/uc_stm32_thread.cpp
+++ b/libuavcan_drivers/stm32/driver/src/uc_stm32_thread.cpp
@@ -105,7 +105,7 @@ int BusEvent::poll(::file* filp, ::pollfd* fds, bool setup)
              *  - Transmission complete. This event is edge-triggered.
              * FIXME Since TX event is edge-triggered, it can be lost between poll() calls.
              */
-            fds->revents |= fds->events & (can_driver_.hasReadableInterfaces() ? 0 : POLLIN);
+            fds->revents |= fds->events & (can_driver_.hasReadableInterfaces() ? POLLIN : 0);
             if (fds->revents != 0)
             {
                 (void)sem_post(fds->sem);